Telegraphonic apparatus



Jan; l7, 1928.

O. MELBY TELEGRAPHONIC APPARATUS Filed March 1. 1927 2 Sheets-Sheet 1 AHPLIFYING UNIT Q i w r EM EEF AV is Jan. 17, 1928.

1,656,216 0. MELBY TELEGRAPHONIC APPARATUS Filed March 1, 1927 2 Sheets-Sheet 2 Patented Jan. l7, 1928.

PATENT OFFICE.

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ransom acme Arum-res.

Application fled ma 1, 1m. and I0. new.

The resent invention relates to improve ments in apparatus for recording and reproducing sound electromagnetically, and relates to that class of apparatus known as 5. the telegraphone.

The primary object of the'inventlon resides in the. provision of apparatus of this character wherein magnetic impresslons of sound waves made upon a moving recording medium by undulating electric currents, wi

po great magnetic qualities for actuation of the reproducing apparatus with great .volume and definiteness of tone when reproducing the recorded sounds. a A further object of the invention resides in the provision of apparatus for electromagnetically recording sound waves, wherein the magnetic impressions are recorded by means of a series of inde ndent para-'- 0 magnetic bodies adapted to moved in rapid succession past-electromagnetic means of the recording apparatus.

A further object of the inventlon resides in the provision of apparatus for electromagnetically recording sound waves, wherein successive .variations in the strength of the electromagnet of the receiving circuit of the apparatusare imparted to independent magnetizable bodies, and which magnetic e0 impressions are retained by the bodies for.

actuation of the reproducing apparatus at a future time.

A further object of the invention resides in the provision of apparatus as set forth, wherein the recording medium is ad'ustable with respect to the receiving an reproducing devices for allowing the varying of the magnetic shield between the devices and the recording medium during recording and reproducin of the sound waves.

A further ob ect of the invention resides in the provision of apparatus for electromagnetically recordin sound, wherein the recording medium em odies a series of independent magnetizable bodies, a number of which are intended to be acted upon at one time by the receiving device, and which bodies are adapted to act in ual-numbers upon the reproducing device or actuation thereof. I

Other objects and advantages of the inventionwill be apparent during the course of the following detailed description, taken in connection with the accompanying drawings. forming a part of this specification and in which drawings:

I Figure 1 is aview part in section and part in elevation of the recording apparatus, and

showing by wayof example one manner in which the rdin medium may be moved past the receiving evice. J Figure 2 1s a view part in section and part in elevation on line 2-2 of Figure 1, and

showing the manner in which the recording medium movespast the receiving device for having magnetic impressions recordal therea, Figure 3 is an enlarged in entary view illustratin the manner in w 'ch the aramagnetic 'dies of the recording m ium are moved past the poles of the receiving device.

Figure 4 is a dia ammatic showing of the apparatus for t e recordingpf sound waves.

Figure 5 is a diagrammatic showin of the apparatus for the reproduction o the recor ed sound waves.

Figure 6 is a view part in section and part in elevation of the reproducing apparatus. J a

Figure 7 is a view part in section and part in elevation of the reproducing up aratus the view being taken at substant1a y a right angle to that of-Figure 6.

Figure 8 is an enlarged fragmentary view on line of Fi ure 6 and illu'stratin the manner in which t e paramagnetic bodies of the recording medium are moved past the armature of the reproducing device.

F1gure 9 is a fragmentary detail sectional view through a. portion of the reproduci device and illustrating the manner in whi dfi the armature is carried thereby.

Figure 10 is a detailed view of a fragmengail'ty portion of the recording medium or Figure 11 is a transverse section through the belt and showin the manner in which the paramagnetic ies are secured thereto.

Flg'ure 12 is a perspective view of the armature of the reproducing device.

F1gure 13 is a sectional view showing a sh htly modified form of recording belt.

eferring to the drawings in detail and wherein similar reference characters designate corresponding parts throughout the several views, the letter A designates I. receiving and recording apparatus by means of which 'variations in an electric current caused by sound vibrations, cause corresponding magnetic impressions to be recorded upon a recording medium B, and which recorded magnetic impressions of'the recording medium serve for subsequent operation of re roducing or translatin apparatus C.

Re erring first to the recor 'ng apparatus A, the same embodies a mountin or frame 5 for rotatable mounting of the rum 6 and a reel 7, and a receiving device 8. The receiving device'8 is in the form of a. telephone receiver and embodies a casing 9 in which is mounted the-pole pieces 10 and 10' and around each of which windings 11 are wound and connected in series-so that the received current passes through both of the windings. The receiving device 8 is mounted by means of the arms 12 u on the frame 5 with the pole pieces 10 an 10' arranged transversely of the drum 6, and as will be observed in Figure 3, the end faces 13 of the pole pieces have a curvature'corresponding to the cylindrical surface of the drum 6.

The reel 7 is preferably mounted between the uprights or standards 14 of the frame 5 by means of a removable shaft 15 for permitting of ready removal and replacing of the reel which serves as a carrier for the reoordin medium B. The drum 6 is mounted in ad ustable bearings 16 mounted in the upri hts 14 for permitting of the circumferenti face of the drum to have adjustment toward and away from the end faces of the pole pieces 10 and 10' for varying of the air gap between the pole pieces and the record- 1n medium B.

e recording medium B may be moved past the receiving device 8, about the drum 6, in an preferred manner, and in the example s own the receiving reel 17 has been provided with a drive means 18 for movement of the recording medium past the pole pieces of the receiving device 8.

The electromagnetic receivin device 8 o erates under the principle of t e usual te ephone receiver, and by observing Figure 4 it will be seen that variations of the e ectric current in the circuit 19, corresponding to the sound vibrations acting upon the transmitter 20, cause variations in the current in the receiver windings 1-1 and produce correspending variations in the magnetic field of t e pole ieces 10 and 10 in accordance with the soun vibrations acting upon the transmitter. These variations in the magnetic field of the pole pieces of the receiving device 8 are recorded in the form of magnetic im ressions upon the recordin medium B.

ferring now to the recor ing medium B, the same embodies a carrier belt or tape 22 which may be formed of an insulating material such as aper, rubber, cloth, or the like, and carri in spaced apart relation throughout the length of the belt, is a series of paramagnetic bodies 23 which may be formed of steel wire or any other suitable metal suitable for receiving and retaining magnetism. These garamagnetic bodies 23 are in the form of shaped magnets,and each forms in efiect, a horse-shoe magnet the poles N and S of which are disposed in spaced relation at one side of the carrier belt 22. By so having the poles N and S approach one another as illustrated in Figures 10 and 11, it will be seen that a strong ma netic field will 'be created in the space 25 etween the terminals of the poleskAs' will be observed in Figures 10 and 11 the bodies 23, and which extend transversely of.

the belt 22, are of wire like formation and project through the belt with their terminals clinched about the opposite face of the belt in the form of staples. It will be seen that the recording medium may be' economically manufactured, since the bodies 23 may be placed along the carrier belt b means of an ordinary type of stapling mac ine.

The recording medium moves about the drum 6 with the terminals N and S of the bodies 23 in confronting relation with the receiver lpole pieces 10 and 10', and by observing igure 2 it will be seen that the terminals N and S pass one beneath each of the receiver pole pieces. As the carrier belt is moved past the electromagnets of the receiving device, successive variations in the strength of the electromagnets will be imparted to successive bodies 23 and retained thereby in the form of magnetic im ressions to serve for operation of the repr ucing or translating a paratus C. By observing Figure 3 it wlll e seen that a number of the C shaped bodies 23 are in confronting relation wit the receiver pole pieces at one time, and that the varying magnetic field of the pole pieces intersect a number of the bodies for creatin varying magnetic impressions upon the b0 ies when passing the receiver pole pieces.

Referrin now to the reproducing apparatusC, t e same embodies a mounting or frame 30 upon which is mounted a microphonic device 31 intended to be operated by means of the magnetic impressions recorded upon the recording medium B.

The device 31 is of ordinary construction andembodies a shell 32 and mouth piece 33 forming a housing within which is mounted a brace 34 for rigid supporting of the usual metal cup 35 in which is disposed the carbon granules 36. Mounted in the cup 35 and contacting with the carbon granules 36, is the usual button 37 having contact at its outer end with the diaphragm 38. In practice, one conductor 39 is connected with the button 37, while a second conductor 40 has connection with the metal cup 35 and pressure on the carbon granules 36 is varied by sound inseam --throughthe brace 34 and are connected at their opposite ends by means of a soft iron block 42 which serves as an armature for ac.- tuation of the button 37 when acted upon by the magnetic impressions recorded on the recordingemedium B. The device 31 is rigidly mounted upon-the frame 30 by means of arms 43 which serve for retaining the armature 42 in fixed relation with respect to the supporting frame,30. I

Mounted in adjustable bearings 44 supported by the frame 30, is a drum 45 of like imensions as that of the drum 6, and which drum 45 by reason of the bearings 44 maybe adjusted toward and away from the armature block 42. The" reel 46' may also be supported by the frame for receiving the belt 32, and any suitable means such as the drive chain'47may be employed for driving of the reel 48 for movement of the recording medium about the drum 45.

The armature 42, and which as will be observed extends transversely of the circumferential face of the drum 45, has a transv versely concaved face 50 disposed in con- -m'agnetically operated am lifier 55. Since the magneticattraction o the m fronting relation to the drum 45, and this face 50 preferably has a curvature corresponding to that of the circumferential face ofthe drum. This armature block 42 is of a width equal to the width of the receiver under the armature block for reproduction of the sounds, as were under the receiver pole pieces during recording of the sounds.

As in Figure 5, the wires 39 and 40 may lead to a suitable amplifying unit and then to an am lifying reproducer which may be locate at any remote point from that of the reproducing apparatus C.

During movement of the recording medium over the drum 45 and past the armature 42, the magnetized bodies 23 will act with varying degrees upon the armature 42 for varying the pressure on the carbon granules 36 and thu .produce a corresponding variable current for operation of the electroetized bodies 23 varies in accordance with t e variation of the sound waves actin through the receiving device for magnetlzing of the bodies, the bodies will act withvarying magnetic attraction upon the armature 42.

B so havi the inde ndently spaced bodi es 23 substiiditiall in tb: shape of horse shoe magnets, with t e poles N and S approaching one another,- an advantage is gained in that both poles will attract the armature 42 and the force with which the armature is attracted to the bodies will be greater and resulting in greater compression of the carbon granules 36 and consequently greater variation of the electric current servmg for operation of the translatin device 55. By so having the drums; 6 an to be moved toward and away from the re.- ceiver poles 10 and 10' and the armature 42 so that a greater magnetic force may be transmitted to the bodies 23 when recording sound, and allowin for the bodies 23 to have greater magnetic attraction for the armature 42' durin reproduction of the recorded sounds. T is adjustment of the magnetized bodies 23 toward and away from the armature 42 will also permit of volume and clarity of tone being obtainable during reproducing of the-recorded sounds.

In the slightly modified form of recordin medium as illustrated in Figure '13, it wi be seen that the bodies 23 have been so positioned upon the carrier belt as to be disposed flush with the op osite faces of the belt and which will resu t in more compact winding of the belt upon the supporting ree s. i

From the foregoing description it will be apparent that a novel and improved apparatus for recording and reproducing sound electromagnetically bodying a I'GGOI'dIIl" medium of improved construction whereby the magnetic impressions recorded'will possess eat mag-. netic attraction for actuation o reproducing apparatus with great volume and defiproducing evices, a recording medium em-- odying a carrier and a series of elongated independent ma netizable bodies supported by the carrier or receivin magnetic impressions from the recording device for subsequent actuation of the reproducing device.

2. In telegraphonic apparatus including magnetically operable recording and reproducmg devices, a recordin medium embodying a carrier and a serles of elongated independent magnetizable bodies supported in spaced relation to extend transversely of the carrier for receiving magnetic impressions from the recording device for subsequent actuation of the reproducing device.

3. In telegraphonic apparatus including magnetically operable recording and reproducing devices, a recordin medium embodying a flexible carrier an aseries of in- 45 adjustable, will allow for the recording medium has been provided, em-

dependent magnetizable bodies supported in spaced relation transversely of the carrier and with their terminals approaching one another at one face of the carrier.

4. A recording medium for telegraphonic apparatus comprising a flexible carrier belt and a series of ma netizable bodies carried by the belt, said bodies being in the form 'of spaced relation and extendin sta les passed throu h the belt with their en 5 directed toward one another at one face of the belt. 4

. 5. A recording medium for'telegraphonic apparatus com rising a flexible carrier belt and a series 0 ma 'netizible bodies carried by the belt, said bodies being passed through 1,ese,aie

the belt and having their ends directed toward one another ut spaced'apart at one face of the belt.

6. A recording medium for telegraphonic apparatus com rising a flexible carrier belt an a series 0 magnetizable bodies carried by the belt, said bodies being arranged in transversely ofthe belt with the ends of t e bodies approaching one another at one face of the i5 belt whereby each body'will constitute in effect a horse shoe magnet for receiving and retaining magnetic impressions.

OLAF MELBY. 

